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https://git.kernel.org/pub/scm/network/wireless/iwd.git
synced 2024-11-25 09:39:25 +01:00
eap-wsc: Handle the M{1,3,5,7} messages
Parse, validate and respond to the M1, M3, M5 and M7 messages and send the M2, M4, M6 and M8.
This commit is contained in:
Andrew Zaborowski
Denis Kenzior
parent
e768f034a3
commit
df60f0ace6
496
src/eap-wsc.c
496
src/eap-wsc.c
@ -958,6 +958,483 @@ clear_keys:
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explicit_bzero(&keys, sizeof(keys));
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}
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static void eap_wsc_r_send_m8(struct eap_state *eap,
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const uint8_t *m7_pdu, size_t m7_len)
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{
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struct eap_wsc_state *wsc = eap_get_data(eap);
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struct wsc_m8_encrypted_settings m8es = {};
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struct wsc_m8 m8;
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uint8_t *pdu;
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size_t pdu_len;
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/* At least: 2 * credential, 12 for Authenticator, 16 for IV + up to 16 pad */
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uint8_t encrypted[1024];
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size_t encrypted_len;
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bool r;
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struct wsc_credential creds[2];
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unsigned int creds_cnt = 0;
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unsigned int auth_types =
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wsc->m1->auth_type_flags & wsc->m2->auth_type_flags;
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if (auth_types & WSC_AUTHENTICATION_TYPE_OPEN)
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memcpy(&creds[creds_cnt++], &wsc->open_cred,
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sizeof(struct wsc_credential));
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if (auth_types & WSC_AUTHENTICATION_TYPE_WPA2_PERSONAL)
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memcpy(&creds[creds_cnt++], &wsc->wpa2_cred,
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sizeof(struct wsc_credential));
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pdu = wsc_build_m8_encrypted_settings(&m8es, creds, creds_cnt,
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&pdu_len);
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explicit_bzero(creds, creds_cnt * sizeof(struct wsc_credential));
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if (!pdu)
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return;
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keywrap_authenticator_put(wsc, pdu, pdu_len);
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r = encrypted_settings_encrypt(wsc, wsc->iv3, pdu, pdu_len,
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encrypted, &encrypted_len);
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explicit_bzero(pdu, pdu_len);
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l_free(pdu);
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if (!r)
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return;
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m8.version2 = true;
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memcpy(m8.enrollee_nonce, wsc->m1->enrollee_nonce,
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sizeof(m8.enrollee_nonce));
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pdu = wsc_build_m8(&m8, encrypted, encrypted_len, &pdu_len);
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if (!pdu)
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return;
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authenticator_put(wsc, m7_pdu, m7_len, pdu, pdu_len);
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eap_wsc_send_message(eap, pdu, pdu_len);
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wsc->state = STATE_EXPECT_DONE;
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}
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static void eap_wsc_r_handle_m7(struct eap_state *eap,
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const uint8_t *pdu, size_t len)
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{
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struct eap_wsc_state *wsc = eap_get_data(eap);
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struct wsc_m7 m7;
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struct iovec encrypted;
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uint8_t *decrypted;
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size_t decrypted_len;
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struct wsc_m7_encrypted_settings m7es;
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enum wsc_configuration_error error = WSC_CONFIGURATION_ERROR_NO_ERROR;
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/* Spec unclear what to do here, see comments in eap_wsc_send_nack */
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if (wsc_parse_m7(pdu, len, &m7, &encrypted) != 0)
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goto send_nack;
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if (memcmp(m7.registrar_nonce, wsc->m2->registrar_nonce,
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sizeof(m7.registrar_nonce)))
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goto send_nack;
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if (!authenticator_check(wsc, pdu, len))
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return;
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decrypted = encrypted_settings_decrypt(wsc, encrypted.iov_base,
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encrypted.iov_len,
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&decrypted_len);
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if (!decrypted) {
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error = WSC_CONFIGURATION_ERROR_DECRYPTION_CRC_FAILURE;
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goto send_nack;
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}
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if (wsc_parse_m7_encrypted_settings(decrypted, decrypted_len, &m7es)) {
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error = WSC_CONFIGURATION_ERROR_DECRYPTION_CRC_FAILURE;
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goto cleanup;
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}
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if (!keywrap_authenticator_check(wsc, decrypted, decrypted_len)) {
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error = WSC_CONFIGURATION_ERROR_DECRYPTION_CRC_FAILURE;
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goto cleanup;
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}
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/* We have E-SNonce2, verify E-Hash2 stored in eap_wsc_r_handle_m3 */
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if (!x_hash_check(wsc, m7es.e_snonce2, wsc->psk2, wsc->e_hash2)) {
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error = WSC_CONFIGURATION_ERROR_DEVICE_PASSWORD_AUTH_FAILURE;
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goto cleanup;
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}
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eap_wsc_r_send_m8(eap, pdu, len);
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cleanup:
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explicit_bzero(&m7es, sizeof(m7es));
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explicit_bzero(decrypted, decrypted_len);
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l_free(decrypted);
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if (!error)
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return;
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send_nack:
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eap_wsc_send_nack(eap, error);
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}
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static void eap_wsc_r_send_m6(struct eap_state *eap,
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const uint8_t *m5_pdu, size_t m5_len)
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{
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struct eap_wsc_state *wsc = eap_get_data(eap);
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struct wsc_m6_encrypted_settings m6es;
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struct wsc_m6 m6;
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uint8_t *pdu;
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size_t pdu_len;
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/* 20 for SNonce, 12 for Authenticator, 16 for IV + up to 16 pad */
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uint8_t encrypted[64];
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size_t encrypted_len;
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bool r;
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memcpy(m6es.r_snonce2, wsc->local_snonce2, sizeof(wsc->local_snonce2));
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pdu = wsc_build_m6_encrypted_settings(&m6es, &pdu_len);
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explicit_bzero(m6es.r_snonce2, sizeof(wsc->local_snonce2));
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if (!pdu)
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return;
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keywrap_authenticator_put(wsc, pdu, pdu_len);
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r = encrypted_settings_encrypt(wsc, wsc->iv2, pdu, pdu_len,
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encrypted, &encrypted_len);
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explicit_bzero(pdu, pdu_len);
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l_free(pdu);
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if (!r)
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return;
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m6.version2 = true;
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memcpy(m6.enrollee_nonce, wsc->m1->enrollee_nonce,
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sizeof(m6.enrollee_nonce));
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pdu = wsc_build_m6(&m6, encrypted, encrypted_len, &pdu_len);
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if (!pdu)
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return;
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authenticator_put(wsc, m5_pdu, m5_len, pdu, pdu_len);
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eap_wsc_send_message(eap, pdu, pdu_len);
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wsc->state = STATE_EXPECT_M7;
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}
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static void eap_wsc_r_handle_m5(struct eap_state *eap,
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const uint8_t *pdu, size_t len)
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{
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struct eap_wsc_state *wsc = eap_get_data(eap);
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struct wsc_m5 m5;
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struct iovec encrypted;
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uint8_t *decrypted;
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size_t decrypted_len;
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struct wsc_m5_encrypted_settings m5es;
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enum wsc_configuration_error error = WSC_CONFIGURATION_ERROR_NO_ERROR;
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/* Spec unclear what to do here, see comments in eap_wsc_send_nack */
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if (wsc_parse_m5(pdu, len, &m5, &encrypted) != 0)
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goto send_nack;
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if (memcmp(m5.registrar_nonce, wsc->m2->registrar_nonce,
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sizeof(m5.registrar_nonce)))
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goto send_nack;
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if (!authenticator_check(wsc, pdu, len))
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return;
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decrypted = encrypted_settings_decrypt(wsc, encrypted.iov_base,
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encrypted.iov_len,
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&decrypted_len);
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if (!decrypted) {
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error = WSC_CONFIGURATION_ERROR_DECRYPTION_CRC_FAILURE;
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goto send_nack;
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}
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if (wsc_parse_m5_encrypted_settings(decrypted, decrypted_len, &m5es)) {
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error = WSC_CONFIGURATION_ERROR_DECRYPTION_CRC_FAILURE;
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goto cleanup;
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}
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if (!keywrap_authenticator_check(wsc, decrypted, decrypted_len)) {
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error = WSC_CONFIGURATION_ERROR_DECRYPTION_CRC_FAILURE;
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goto cleanup;
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}
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/* We have E-SNonce1, verify E-Hash1 stored in eap_wsc_r_handle_m3 */
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if (!x_hash_check(wsc, m5es.e_snonce1, wsc->psk1, wsc->e_hash1)) {
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error = WSC_CONFIGURATION_ERROR_DEVICE_PASSWORD_AUTH_FAILURE;
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goto cleanup;
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}
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eap_wsc_r_send_m6(eap, pdu, len);
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cleanup:
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explicit_bzero(&m5es, sizeof(m5es));
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explicit_bzero(decrypted, decrypted_len);
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l_free(decrypted);
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if (!error)
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return;
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send_nack:
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eap_wsc_send_nack(eap, error);
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}
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static void eap_wsc_r_send_m4(struct eap_state *eap,
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const uint8_t *m3_pdu, size_t m3_len)
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{
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struct eap_wsc_state *wsc = eap_get_data(eap);
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struct wsc_m4_encrypted_settings m4es;
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struct wsc_m4 m4;
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uint8_t *pdu;
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size_t pdu_len;
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/* 20 for SNonce, 12 for Authenticator, 16 for IV + up to 16 pad */
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uint8_t encrypted[64];
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size_t encrypted_len;
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bool r;
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size_t len;
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size_t len_half1;
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struct iovec iov[4];
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memcpy(m4es.r_snonce1, wsc->local_snonce1, sizeof(wsc->local_snonce1));
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pdu = wsc_build_m4_encrypted_settings(&m4es, &pdu_len);
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explicit_bzero(m4es.r_snonce1, sizeof(wsc->local_snonce1));
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if (!pdu)
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return;
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keywrap_authenticator_put(wsc, pdu, pdu_len);
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r = encrypted_settings_encrypt(wsc, wsc->iv1, pdu, pdu_len,
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encrypted, &encrypted_len);
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explicit_bzero(pdu, pdu_len);
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l_free(pdu);
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if (!r)
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return;
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len = strlen(wsc->device_password);
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/* WSC 2.0.5, Section 7.4:
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* In case the UTF8 representation of the DevicePassword length is an
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* odd number (N), the first half of DevicePassword will have length
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* of N/2+1 and the second half of the DevicePassword will have length
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* of N/2.
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*/
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len_half1 = (len + 1) / 2;
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l_checksum_update(wsc->hmac_auth_key, wsc->device_password, len_half1);
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l_checksum_get_digest(wsc->hmac_auth_key, wsc->psk1, sizeof(wsc->psk1));
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l_checksum_update(wsc->hmac_auth_key, wsc->device_password + len_half1,
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len / 2);
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l_checksum_get_digest(wsc->hmac_auth_key, wsc->psk2, sizeof(wsc->psk2));
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m4.version2 = true;
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memcpy(m4.enrollee_nonce, wsc->m1->enrollee_nonce,
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sizeof(m4.enrollee_nonce));
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/* WSC 2.0.5, Section 7.4:
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* The Registrar creates two 128-bit secret nonces, R-S1, R-S2 and then
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* computes:
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* R-Hash1 = HMACAuthKey(R-S1 || PSK1 || PKE || PKR)
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* R-Hash2 = HMACAuthKey(R-S2 || PSK2 || PKE || PKR)
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*/
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iov[0].iov_base = wsc->local_snonce1;
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iov[0].iov_len = sizeof(wsc->local_snonce1);
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iov[1].iov_base = wsc->psk1;
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iov[1].iov_len = sizeof(wsc->psk1);
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iov[2].iov_base = wsc->m1->public_key;
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iov[2].iov_len = sizeof(wsc->m1->public_key);
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iov[3].iov_base = wsc->m2->public_key;
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iov[3].iov_len = sizeof(wsc->m2->public_key);
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l_checksum_updatev(wsc->hmac_auth_key, iov, 4);
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l_checksum_get_digest(wsc->hmac_auth_key,
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m4.r_hash1, sizeof(m4.r_hash1));
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iov[0].iov_base = wsc->local_snonce2;
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iov[0].iov_len = sizeof(wsc->local_snonce2);
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iov[1].iov_base = wsc->psk2;
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iov[1].iov_len = sizeof(wsc->psk2);
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l_checksum_updatev(wsc->hmac_auth_key, iov, 4);
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l_checksum_get_digest(wsc->hmac_auth_key,
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m4.r_hash2, sizeof(m4.r_hash2));
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pdu = wsc_build_m4(&m4, encrypted, encrypted_len, &pdu_len);
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if (!pdu)
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return;
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authenticator_put(wsc, m3_pdu, m3_len, pdu, pdu_len);
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eap_wsc_send_message(eap, pdu, pdu_len);
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wsc->state = STATE_EXPECT_M5;
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}
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static void eap_wsc_r_handle_m3(struct eap_state *eap,
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const uint8_t *pdu, size_t len)
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{
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struct eap_wsc_state *wsc = eap_get_data(eap);
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struct wsc_m3 m3;
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if (wsc_parse_m3(pdu, len, &m3) != 0)
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goto send_nack;
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if (memcmp(m3.registrar_nonce, wsc->m2->registrar_nonce,
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sizeof(m3.registrar_nonce)))
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goto send_nack;
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if (!authenticator_check(wsc, pdu, len))
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return;
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/* We can't verify these until we receive the E-S1/E-S2 in M5/M7 */
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memcpy(wsc->e_hash1, m3.e_hash1, sizeof(m3.e_hash1));
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memcpy(wsc->e_hash2, m3.e_hash2, sizeof(m3.e_hash2));
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eap_wsc_r_send_m4(eap, pdu, len);
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return;
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send_nack:
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/* Spec unclear what to do here, see comments in eap_wsc_send_nack */
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eap_wsc_send_nack(eap, WSC_CONFIGURATION_ERROR_NO_ERROR);
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}
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static void eap_wsc_r_send_m2(struct eap_state *eap,
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const uint8_t *m1_pdu, size_t m1_len)
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{
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struct eap_wsc_state *wsc = eap_get_data(eap);
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uint8_t *pdu;
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size_t pdu_len;
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wsc->m2->version2 = true;
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memcpy(wsc->m2->enrollee_nonce, wsc->m1->enrollee_nonce, 16);
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wsc->m2->association_state = WSC_ASSOCIATION_STATE_NOT_ASSOCIATED;
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wsc->m2->configuration_error = WSC_CONFIGURATION_ERROR_NO_ERROR;
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pdu = wsc_build_m2(wsc->m2, &pdu_len);
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if (!pdu)
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return;
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authenticator_put(wsc, m1_pdu, m1_len, pdu, pdu_len);
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eap_wsc_send_message(eap, pdu, pdu_len);
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wsc->state = STATE_EXPECT_M3;
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}
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static void eap_wsc_r_handle_m1(struct eap_state *eap,
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const uint8_t *pdu, size_t len)
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{
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struct eap_wsc_state *wsc = eap_get_data(eap);
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struct l_key *remote_public;
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uint8_t shared_secret[192] = { 0 };
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size_t shared_secret_len = sizeof(shared_secret);
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struct l_checksum *sha256;
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uint8_t dhkey[32];
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struct l_checksum *hmac_sha256;
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struct iovec iov[3];
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uint8_t kdk[32];
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struct wsc_session_key keys;
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bool r;
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uint8_t expected_enrollee_mac[6];
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uint8_t expected_uuid_e[16];
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memcpy(expected_enrollee_mac, wsc->m1->addr, 6);
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memcpy(expected_uuid_e, wsc->m1->uuid_e, 16);
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/* Spec unclear what to do here, see comments in eap_wsc_send_nack */
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if (wsc_parse_m1(pdu, len, wsc->m1) != 0) {
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eap_wsc_send_nack(eap, WSC_CONFIGURATION_ERROR_NO_ERROR);
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return;
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}
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if (memcmp(expected_enrollee_mac, wsc->m1->addr, 6) ||
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memcmp(expected_uuid_e, wsc->m1->uuid_e, 16)) {
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eap_wsc_send_nack(eap,
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WSC_CONFIGURATION_ERROR_MULTIPLE_PBC_SESSIONS_DETECTED);
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eap_method_error(eap);
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return;
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}
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if (wsc->m1->state != WSC_STATE_NOT_CONFIGURED ||
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!(wsc->m1->auth_type_flags &
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wsc->m2->auth_type_flags) ||
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!(wsc->m1->encryption_type_flags &
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wsc->m2->encryption_type_flags) ||
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!(wsc->m1->connection_type_flags &
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wsc->m2->connection_type_flags) ||
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!(wsc->m1->config_methods &
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wsc->m2->config_methods) ||
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!(wsc->m1->rf_bands & wsc->m2->rf_bands)) {
|
||||
eap_wsc_send_nack(eap, WSC_CONFIGURATION_ERROR_NO_ERROR);
|
||||
return;
|
||||
}
|
||||
|
||||
if (wsc->m1->configuration_error != WSC_CONFIGURATION_ERROR_NO_ERROR ||
|
||||
wsc->m1->device_password_id !=
|
||||
wsc->m2->device_password_id) {
|
||||
eap_wsc_send_nack(eap, WSC_CONFIGURATION_ERROR_NO_ERROR);
|
||||
return;
|
||||
}
|
||||
|
||||
/* m1->request_to_enroll not checked */
|
||||
|
||||
if (!l_key_validate_dh_payload(wsc->m1->public_key,
|
||||
sizeof(wsc->m1->public_key),
|
||||
crypto_dh5_prime,
|
||||
crypto_dh5_prime_size))
|
||||
return;
|
||||
|
||||
/*
|
||||
* Done validating the M1, we can now derive the keys for most of
|
||||
* the rest of the registration protocol.
|
||||
*/
|
||||
|
||||
remote_public = l_key_new(L_KEY_RAW, wsc->m1->public_key,
|
||||
sizeof(wsc->m1->public_key));
|
||||
if (!remote_public)
|
||||
return;
|
||||
|
||||
r = l_key_compute_dh_secret(remote_public, wsc->private, dh5_prime,
|
||||
shared_secret, &shared_secret_len);
|
||||
l_key_free(remote_public);
|
||||
|
||||
if (!r)
|
||||
return;
|
||||
|
||||
sha256 = l_checksum_new(L_CHECKSUM_SHA256);
|
||||
if (!sha256)
|
||||
return;
|
||||
|
||||
l_checksum_update(sha256, shared_secret, shared_secret_len);
|
||||
explicit_bzero(shared_secret, shared_secret_len);
|
||||
l_checksum_get_digest(sha256, dhkey, sizeof(dhkey));
|
||||
l_checksum_free(sha256);
|
||||
|
||||
hmac_sha256 = l_checksum_new_hmac(L_CHECKSUM_SHA256,
|
||||
dhkey, sizeof(dhkey));
|
||||
explicit_bzero(dhkey, sizeof(dhkey));
|
||||
|
||||
if (!hmac_sha256)
|
||||
return;
|
||||
|
||||
iov[0].iov_base = wsc->m1->enrollee_nonce;
|
||||
iov[0].iov_len = 16;
|
||||
iov[1].iov_base = wsc->m1->addr;
|
||||
iov[1].iov_len = 6;
|
||||
iov[2].iov_base = wsc->m2->registrar_nonce;
|
||||
iov[2].iov_len = 16;
|
||||
|
||||
l_checksum_updatev(hmac_sha256, iov, 3);
|
||||
l_checksum_get_digest(hmac_sha256, kdk, sizeof(kdk));
|
||||
l_checksum_free(hmac_sha256);
|
||||
|
||||
r = wsc_kdf(kdk, &keys, sizeof(keys));
|
||||
explicit_bzero(kdk, sizeof(kdk));
|
||||
if (!r)
|
||||
return;
|
||||
|
||||
wsc->hmac_auth_key = l_checksum_new_hmac(L_CHECKSUM_SHA256,
|
||||
keys.auth_key,
|
||||
sizeof(keys.auth_key));
|
||||
|
||||
/*
|
||||
* AuthKey is uploaded into the kernel, once we upload KeyWrapKey,
|
||||
* the keys variable is no longer useful. Make sure to wipe it
|
||||
*/
|
||||
wsc->aes_cbc_128 = l_cipher_new(L_CIPHER_AES_CBC, keys.keywrap_key,
|
||||
sizeof(keys.keywrap_key));
|
||||
explicit_bzero(&keys, sizeof(keys));
|
||||
|
||||
eap_wsc_r_send_m2(eap, pdu, len);
|
||||
}
|
||||
|
||||
static void eap_wsc_handle_nack(struct eap_state *eap,
|
||||
const uint8_t *pdu, size_t len)
|
||||
{
|
||||
@ -1134,6 +1611,7 @@ static void eap_wsc_handle_message(struct eap_state *eap,
|
||||
return;
|
||||
|
||||
switch (wsc->state) {
|
||||
/* Enrollee state machine */
|
||||
case STATE_EXPECT_START:
|
||||
return;
|
||||
case STATE_EXPECT_M2:
|
||||
@ -1151,6 +1629,24 @@ static void eap_wsc_handle_message(struct eap_state *eap,
|
||||
case STATE_FINISHED:
|
||||
eap_wsc_send_nack(eap, WSC_CONFIGURATION_ERROR_NO_ERROR);
|
||||
return;
|
||||
|
||||
/* Registrar state machine */
|
||||
case STATE_EXPECT_M1:
|
||||
eap_wsc_r_handle_m1(eap, pkt, len);
|
||||
break;
|
||||
case STATE_EXPECT_M3:
|
||||
eap_wsc_r_handle_m3(eap, pkt, len);
|
||||
break;
|
||||
case STATE_EXPECT_M5:
|
||||
eap_wsc_r_handle_m5(eap, pkt, len);
|
||||
break;
|
||||
case STATE_EXPECT_M7:
|
||||
eap_wsc_r_handle_m7(eap, pkt, len);
|
||||
break;
|
||||
case STATE_EXPECT_IDENTITY:
|
||||
case STATE_EXPECT_DONE:
|
||||
eap_wsc_send_nack(eap, WSC_CONFIGURATION_ERROR_NO_ERROR);
|
||||
return;
|
||||
}
|
||||
|
||||
if (wsc->rx_pdu_buf) {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user